package cn.tedu.v6;

import java.io.*;
import java.net.ConnectException;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

/**
 *
 *Client客户端--改成Server端模式【优化】
 *
 */
public class Client {
    private Socket socket;
    private static final String HOST="192.168.120.180";
    private static final Integer PORT=4545;
    private BufferedReader br;
    private PrintWriter pw;
     private String ip;

    public Client(){
        try {
            socket=new Socket("192.168.120.180",PORT);
            br=new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF8"));
            pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);}catch(NullPointerException e){
            System.out.println("友情提示：IP传入错误导致链接失败~");

        }catch(UnknownHostException e){
            System.out.println("友情提示：IP传入错误");
        }catch(ConnectException e){
            System.out.println("客户端链接失败：0建议检查IP或者端口号");
        }catch (IOException e) {
            System.out.println("客户端链接服务器失败，提示：检查IP/端口");
        }
    }

    public void start() {
        //与服务器端交互--参考Server端
        System.out.println("欢迎使用jq牌QQ聊天室~~");
        Scanner input=new Scanner(System.in);
        try {
            //1.读入服务器端：”请输入用户名：“
           String serverMessage=br.readLine();
            System.out.println(serverMessage);
            //1.2用户输入--用户名
           String username=input.nextLine();
           //1.3用户输入的用户名--写出给服务器端
            pw.println(username);

            //2.1读入服务器端发来“请输入密码：”
            serverMessage=br.readLine();
            System.out.println(serverMessage);
            //2.2用户输入--密码--写出给服务器端
            String password=input.nextLine();
            pw.println(password);

            //3.登录之后【登录成功，登录失败】--才可以聊天
            serverMessage=br.readLine(); //读入【登录成功，登录失败】
            //字符串方法：startWith() 返回值boolean 前缀名称一致true
            if(serverMessage.startsWith("登录成功")){
                //封一个客户端的：读写流--chat聊天
                chat();
            }
        } catch(IOException e){
            System.out.println("客户端断开连接了");
        } finally{
            if(br!= null)
                try {
                    br.close();
                }catch (IOException e) {
                    System.out.println("结束通讯，关闭失败！");
                }
            if(pw!=null)
                pw.close();
            if(socket!=null&&!socket.isClosed())
                try {
                    socket.close();
                }catch (IOException e) {
                    System.out.println("客户端关闭失败");
                }
            if (socket!= null &&!socket.isClosed())
                try {
                    socket.close();
                } catch (IOException e) {
                    System.out.println("通讯关闭失败");
                }
        }
    }
//封装一个针对聊天功能：读写 chat()
    private void chat(){
        new Thread(()->{
            try {
                String message;
                while((message=br.readLine())!=null){
                    System.out.println("服务器端说："+message);
                    System.out.println("客户端请输入：");
                }
            } catch (IOException e) {
                System.out.println("服务器端读入失败！");
            }
        }).start();

        Scanner input = new Scanner(System.in);
        while (true){
            String say=input.nextLine();
            pw.println("客户端说："+say);
            System.out.println("客户端请输入：");
            //客户端输入exit退出聊天
            if(say.equalsIgnoreCase("exit")){
                //如果输入为exit，关闭链接
                pw.println("exit");//打印exit
                System.out.println(ip+"退出聊天室");
                System.exit(0);
            }
        }

    }
    public static void main(String[] args){
        new Client().start();
    }
}
